Every single time I listen to the full version of that OPM opening song
I imagine Genos pseudo-conducting the gang of male heroes and every time the screaming parts come in he just points his incinerating palms at whatever monsters they have in hostage, with help from King
And Saitama just chips in at the ‘WAN PAWWNNNCH’ part from the top of a building(so no one knows it’s him), then takes the mic at the last part.
And Tastumaki and Fubuki are in charge of the bass and guitars